I appreciate your comments very much,thank you.
Yes, the sky is actually manipulated. It is the original sky, but on the original image the sky was dull, grey-greenish/blueish. On the other hand, a few days later, after I got home and finally downloaded the image to my computer, I wondered why the sky came out that dull, since I remebered it more vivid at the moment of the shot So I went with P7 to work on it. To my surprise this sky literally poped out of the dullish grey. At the end I got to